324 Mr. E. A. Smith on 



validis 8 (in anfr. ultimo modo 6, illis versus labrum distantibus, 

 ad basim productis) iustructi, et liris spiralibus tenuibus 5-6 (in 

 anfr. ultimo circiter 12, paucis ad basim sujjra costas nodulosis) 

 et inter illas striis spiralibus minutis concinne ornati ; apertura 

 longit. totius ad ^ gequans ; labrum costa ultima valde incrassa- 

 tum, superne satis sinuatum ; canalis brevis, truncatus. 

 Long. 51 mill., diam. 2. 



Hah. Persian Gulf {Col Felly). 



The short ribs are produced somewliat at their upper extre- 

 mity, and when they happen to be placed so that they fall 

 between the ribs on the whorls above, a very pretty undulating 

 suture is thus exhibited. 



Pleurotoma [Clathurella'^) crehriUrata. 



Testa fusiformis, fuscesGenti-alba, dimidio infero anfr. ultimi fusco ; 

 anfraelus 7, supremi duo couvexi, Iseves, eteteri superne excavati, 

 deinde convexiusculi, costis rotundatis 10, superne in exeavatione 

 fere obtoktis (in anfr. ultimo prope medium evanidis) instructi, 

 et liris confertis supia costas leviter incrassatis (illis in exeava- 

 tione sitis quam ca'tcrse gracilioribus) cincti ; apertura parva, 

 longitudinis totius circiter -f^ a?quans ; labrum tenue, paululum 

 pone marginem costa ultima incrassatum, superne ad suturam 

 subprofunde incisum ; canalis angustus, paululum elougatus. 



Long, 6i millim., diam. 2^. 



//o5. Persian Uulf (CoZ. PcZ/^). 



Of the spiral lirations (about eight in a whorl) the three or 

 lour upper ones are finer than those beneath, and between the 

 latter sometimes very slender intermediate ones are traceable. 

 The lirffi encircling the lower half of the body-whorl ai^e 

 faintly granulons. The slit in the labrum is situated at the 

 suture, as in typical Clathurelkc^ but the apical whorls are not 

 cancellated. 



Pleurotoma [Clathurella) jamaicensis. 



Testa ovato-fusiformis, turrita, sordide albida, ad suturam fusco 

 obscure tincta ; anfractus 7, supremi duo Iseves, vitrei, tertius 

 convexus, granose rcticulatus, caefeii superne oblique tabulati, 

 medio acute angulati, infra angulum suturam versus contracti, 

 costis ad 11 (in anfr. ultimo fere ad basim productis) instructi, et 

 liris spiralibus 4. suprema ad angulum sita (in anfr. ultimo circiter 

 15) cincti, et supra angulum iuterque liras ubique tenuissime 

 spiraliter striati ; apertura angusta, longit. totius quam i paulo 

 minor ; labrum margine fusco, extus incrassatum, superne leviter 

 scd distincte sinuatum, iutus laeve ; canalis angustatus, paululum 

 productus, levissime recurvus. 



Long. 5 mill., diam. 2. 



Hab. Jamaica. 



